From framework to library...

gistfile1.txt

public class VigilEngine 
{
    private readonly Beam _beam;

    public VigilEngine(Beam beam)
    {
        _beam = beam;
        Console.WriteLine("Creating engine. {0}", Thread.CurrentThread.ManagedThreadId);

        while (true)
        {
            var msg = beam.Receive();
            start(msg);
        }
    }

    private void start(BeamMessage message)
    {
        if ((string) message.Message == "start")
        {
            var sup = _beam.Spawn("vigilsupervisor", null);
            _beam.Send(sup, "start");
        }
    }
}